Good idea! The forum guidelines should serve as far as conduct of the participants, but the debate format must be defined.
If willing participants for a Great Debate are available now, then it is suggested that the format be alternating posts by the two participants with comments by the moderator, if any, after each pair of posts. No one else should post to the thread, so comments on the debate should be posted to a parallel thread.
Adminnemooseus will have to serve as moderator in the near term as the EvC Forum Administrator has insufficient time at present.
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--EvC Forum Administrator